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Method for supporting multicast service in ethernet passive optical network system

Inactive Publication Date: 2009-01-20
ELECTRONICS & TELECOMM RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a method for transmitting multicast packets in an Ethernet Passive Optical Network (EPON) system. The method allows for the efficient transmission of multicast packets to multiple optical network unit systems only when a multicast service is provided. The method includes monitoring multicast protocol reports, creating multicast forwarding tables, and transmitting the multicast packet to the appropriate optical network unit system using the appropriate forwarding table. The technical effect of this invention is to improve the efficiency and reliability of transmitting multicast packets in an EPON system.

Problems solved by technology

Accordingly, a problem is generated that all subscribers belonging to the ONU system receive the multicast packet having no concern with them.

Method used

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  • Method for supporting multicast service in ethernet passive optical network system
  • Method for supporting multicast service in ethernet passive optical network system
  • Method for supporting multicast service in ethernet passive optical network system

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Embodiment Construction

[0020]Hereinafter, embodiments of the present invention will be described in detail with reference to the appended drawings. The same reference numbers refer to the same components throughout the drawings.

[0021]FIG. 1 is a block diagram of an Ethernet Passive Optical Network (EPON) system to which the present invention is applied. Referring to FIG. 1, an EPON system 100 which is located at the root of a tree structure includes an Optical Line Terminal (OLT) system 120, an Optical Distribution Network (ODN) 160, and a plurality of Optical Network Unit (ONU) systems 170.

[0022]The OLT system 120, which is a terminal of a service provider, converts electrical signals to optical signals and provides the optical signals to respective subscribers of the EPON. That is, the OLT system 120 connects subscriber traffic to service nodes 80 that support an IP network, a TDM (Time Division Multiplex) / PSTN (Public Switched Telephone Network) network, a video / audio network, a MPLS (Multiprotocol Lab...

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Abstract

There is provided a method for supporting a multicast service in an Ethernet passive optical network system. Since an Optical Network Unit (ONU) system monitors an IGMP (Internet Group Management Protocol) message and informs the monitored result of an Optical Line Terminal (OLT) system so that the OLT system creates L2 multicast forwarding table using a multicast address and ONU ID information in a PON port, the ONU system transmits the multicast packet only to a corresponding subscriber on the basis of the L2 multicast forwarding table when receiving a multicast packet. Therefore, it is possible to transfer a multicast packet only to a specific ONU system belonging to a corresponding multicast address group among a plurality of ONU systems.

Description

BACKGROUND OF THE INVENTION[0001]This application claims the priority of Korean Patent Application No. 2003-92590, filed on Dec. 17, 2003, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference.[0002]1. Field of the Invention[0003]The present invention relates to a method for supporting a multicast service, and more particularly, to a method for supporting a multicast service in an Ethernet Passive Optical Network (EPON).[0004]2. Description of the Related Art[0005]To allow an EPON system to support a multicast service, an Optical Line Terminal (OLT) system must support a multicast service for each port of each line card, and a PON (Passive Optical Network) port of the OLT system must support a multicast service for each Optical Network Unit (ONU) system. Also, the ONU system must support a multicast service for each subscriber port.[0006]An OLT system supports a multicast service for its ports using L3 (Layer 3) routi...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H04L12/28H04J3/26H04L25/02H04L12/18H04L12/413
CPCH04L12/18H04L25/02
Inventor SUNG, JUNG SIKKIMLEE, HYEONG HO
Owner ELECTRONICS & TELECOMM RES INST
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